I tried to figure it out, but I can't see a certain indication on the Fender website. I bought the left-handed version of the American Deluxe Jazz brand-new from a local shop. Based on the feel, blackish silk ends and the fact that this Jazz has a string-through body, I'm assuming they're Fender 8250M Super Bass strings? I haven't really made myself too familiar with roundcore strings or Fender strings, so this is a bit new to me. I just want to be sure I know what's currently on them, to have a sense of tonal direction should I opt to replace them. I probably won't for a while, because the stock ones sound really good for fingerstyle.